Wyddial is a village and civil parish in the East Hertfordshire District of Hertfordshire, England. It is located around a mile and a half northeast of Buntingford and lies due north of Greenwich on the Prime Meridian.
The parish church of St Giles dates from the 14th century when the nave was built. The tower and chancel date from the 15th century.
Wyddial Hall is a Grade II listed building, originally built in the early 16th century. The hall is situated just north of the church and has access via the churchyard. In 1733 it was remodelled after a damaging fire for Francis Goulston. By 1780 it had been acquired by John Thomas Ellis, MP for Lostwithiel, who made alterations, and later changes were made by Charles Heaton-Ellis. Admiral Edward Heaton-Ellis (1868-1943), who fought in the Battle of Jutland, was born at Wyddial.